Improvement in dental instruments



UNIED STATES PATENT OFFICE.

CHAELEs E. MACK, OE PORTLAND, OREGON.

IMPRGVEMENT IN DENTAL INSTRUMENTS.

Specification forming part of Letters Patent No. 117,904, dated August 8, 1871.

To all whom it may concern:

Be it known that I, CHARLEs H. MACK, of Portland, in the county 'ofMultnomaln in the State of Oregon, have invented a certain Dental Instrument used in dental operations; and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawing making apart of this specification.

In the drawing, B represents the complete tool, and d certain minute pins to be holden and inserted in very small holes drilled and tapped in sound dentine of natural teeth. The chamber ofthe tool B (or otherwise a socket in which pins d are held for immediate use) is about one thirtysecond of an inch in diameter, varying' in said diameter according to size of pins d to be used. In the drawing at Figure 1 a cylindrical bore is terminated by a V-shaped countersink or groove across the small end of the tool, so that it exactly iits over the slightly Wedge-shaped end of the pins d. Another forni consists in cutting across the socket, so that pins with iiattened heads may be inserted in the slots. (For reference see Fig. 2 at B and d.) The inventor uses the forni shown at B, Fig. 1, in preference to other forms, because it is less liable to get out of l,

repair, and because it is so peculiarly adapted to holding the pins d While in an inverted position, as by a little pressure upon the slightly Wedgeshaped end ofthe pin d it is retained Within the socket While being used in any required position. The pins d being made of gold or other metallic wire, on which a screw-thread is out, the tool B being a kind of Wrench or screw-carrier for inserting these very small pins d in certain holes drilled and tapped in the sound dentine of the natural teeth, these pins being used for the purpose of retaining dental filling.

It is essential that this dental tool shall occupy as little space as possible, for, in many instances, it is required to insert pins Within delicate cavities in the approximal surfaces of frail teeth, in which cases a cu'mbrous instrument could not be used; thus it should be made of fine steel, and, having the shape as above set forth, it is believed to be peculiarly adapted, and that it is of an original character and use.

I claim- As a dental instrument, the combined socket and Wrench With the opening' or recess at the end of the shank to receive and hold a pin or screw, as described.

Witnesses: OHAS. H. MACK.

ANDREW J MosEs, G. W. CANNON. 

